content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.debug;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
  
  /**
   * Wraps a Publisher and inject the assembly info.
   *
   * @param <T> the value type
   */
  final class SingleOnAssembly<T> extends Single<T> {
  
      final SingleSource<T> source;
  
      final RxJavaAssemblyException assembled;
  
      SingleOnAssembly(SingleSource<T> source) {
          this.source = source;
          this.assembled = new RxJavaAssemblyException();
      }
  
      @Override
      protected void subscribeActual(SingleObserver<? super T> observer) {
          source.subscribe(new OnAssemblySingleObserver<T>(observer, assembled));
      }
  
      static final class OnAssemblySingleObserver<T> implements SingleObserver<T>, Disposable {
  
          final SingleObserver<? super T> downstream;
  
          final RxJavaAssemblyException assembled;
  
          Disposable upstream;
  
          OnAssemblySingleObserver(SingleObserver<? super T> downstream, RxJavaAssemblyException assembled) {
              this.downstream = downstream;
              this.assembled = assembled;
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              if (DisposableHelper.validate(this.upstream, d)) {
                  this.upstream = d;
  
                  downstream.onSubscribe(this);
              }
          }
  
          @Override
          public void onSuccess(T value) {
              downstream.onSuccess(value);
          }
  
          @Override
          public void onError(Throwable t) {
              downstream.onError(assembled.appendLast(t));
          }
  
          @Override
          public boolean isDisposed() {
              return upstream.isDisposed();
          }
  
          @Override
          public void dispose() {
              // don't break the link here
              upstream.dispose();
          }
      }
  }
  